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Correlation between right atrial venous blood gasometry and cardiac index in cardiac surgery postoperative period
João Jackson Duarte1, José Carlos Dorsa Vieira Pontes, Otoni Moreira Gomes
1Cardiovascular Surgery Service, Hospital Regional de Mato Grosso do Sul, Cardiovascular Surgery Service, University Hospital, Federal University of Mato Groso do Sul, Campo Grande, MS, Brasil.
Insights
Venous oxygen saturation (SvO2) and artery-venous oxygen content difference (C(a-v)O2) reliably estimate low cardiac output in cardiac surgery patients postoperatively. Partial pressure of venous oxygen (PvO2) showed poor sensitivity for this estimation.
Area of Science:
- Cardiovascular Physiology
- Critical Care Medicine
- Surgical Monitoring
Background:
- Accurate assessment of cardiac index is crucial in the postoperative period for patients undergoing cardiac surgery.
- Low cardiac output is a significant complication that requires timely and reliable detection.
Purpose of the Study:
- To evaluate the reliability of central venous blood gasometry parameters in correlating with cardiac index during the postoperative period.
- To determine if venous oxygen saturation (SvO2) and artery-venous oxygen content difference (C(a-v)O2) can serve as effective indicators of low cardiac output.
Main Methods:
- Arterial and venous blood samples from the right atrium were analyzed post-cardiac surgery.
- Hemoglobin concentration, SvO2, partial pressure of venous oxygen (PvO2), and C(a-v)O2 were measured.
- These parameters were compared against the cardiac index determined by thermodilution.
Main Results:
- A strong correlation was observed between SvO2, C(a-v)O2, and the cardiac index measured by thermodilution.
- Both SvO2 and C(a-v)O2 demonstrated good sensitivity, specificity, and predictive values.
- PvO2 showed poor sensitivity in estimating low cardiac output.
Conclusions:
- SvO2 and C(a-v)O2 are reliable and safe parameters for assessing low cardiac output in the postoperative cardiac surgery setting.
- PvO2 is not a sensitive indicator for estimating low output in this patient population.
Objective:
To determine, even during postoperative period, the confiability of the cardiac index correlate with the data data given by a central atrial venous blood gasometry in patients who underwent cardiac surgery.
Methods:
From the sample of arterial and venous blood of right atrium gathered in postoperative of cardiac surgery, it was determinated the hemoglobin concentration and the gasometric study through what was observed of the venous oxygen saturation (SvO2) and the partial pressure of oxygen from venous blood gathered in right atrium (PvO2), add to the calculation of artery-venous difference of the oxygen content--radial artery / right atrium (C( a-v )O2). Afterwards, these parameters were compared with the cardiac index determined by thermodilution.
Results:
There was good correlation between SvO2, C(av)O2 of the venous right atrial blood and cardiac index measured by thermodilution method, with sensibility and specificity good and high positive predict value and negative predict value. The PvO2 demonstrated poor sensibility in the estimative of low output.
Conclusion:
In cardiac surgery postoperative, the SvO2 and the C(a-v)O2 were safe parameters correlated with low cardiac output. The PvO2 demonstrated poor sensibility in the estimative of low output in postoperative cardiac surgery.
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